## How much wood can you expect from your logs?

### Good to Know

- One
**board foot**(BDFT) is 1”x 12”x 12”. **Kerf**is the thickness of the blade cut that produces wasted sawdust.

### Volume Calculation Methods

There are several scales that can be used to estimate the BDFT yield of logs: the Doyle, the Scribner, and the International.

- The Doyle rule was developed by Edward Doyle prior to 1850. This rule tends to be inaccurate in estimating log volumes due overestimating large logs while underestimating small logs.
- J. A. Scribner developed the Scribner Log rule in 1846. It is based on a log diagram of 1” slabs and a ¼” kerf loss. This method does not have allowances for log tapering and thus underestimates the volume of longer log lengths.
- The International scale was originally developed by John C. Clark in 1906 as the 1/8” rule. In 1917 he developed the 1/4” rule, which is the formula used today. This International scale is based on a mathematical formula that accounts for log tapering and a 1/4″ blade kerf.

Of these three, the Doyle rule is the least accurate, the Scribner rule is an intermediate estimator, and *the International 1/4” scale is the most accurate. *

**Because of the thin kerf of the Wood-Mizer mill, there is significantly less waste, which results in yields that exceed all three scales. I use the International 1/4 inch rule for estimating. You can use the table below to estimate the volume of your logs**.

Gross Volume of a log, International 1/4" Rule. | ||||||

Measure diameter inside bark at small end of log. |
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Read volume in Board Feet. |
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Diameter of log small end | Length of log | |||||

8 | 10 | 12 | 14 | 16 | 18 | |

6 | 10 | 10 | 15 | 15 | 20 | 25 |

7 | 10 | 15 | 20 | 25 | 30 | 35 |

8 | 15 | 20 | 25 | 35 | 40 | 45 |

9 | 20 | 30 | 35 | 45 | 50 | 60 |

10 | 30 | 35 | 45 | 55 | 65 | 75 |

11 | 35 | 45 | 55 | 70 | 80 | 95 |

12 | 45 | 55 | 70 | 85 | 95 | 110 |

13 | 55 | 70 | 85 | 100 | 115 | 135 |

14 | 65 | 80 | 100 | 115 | 135 | 155 |

15 | 75 | 95 | 115 | 135 | 160 | 180 |

16 | 85 | 110 | 130 | 155 | 180 | 205 |

17 | 95 | 125 | 150 | 180 | 205 | 265 |

18 | 110 | 140 | 170 | 200 | 230 | 265 |

19 | 125 | 155 | 190 | 225 | 260 | 300 |

20 | 135 | 175 | 210 | 250 | 290 | 330 |

21 | 155 | 195 | 235 | 280 | 320 | 365 |

22 | 170 | 215 | 260 | 305 | 355 | 405 |

23 | 185 | 235 | 285 | 335 | 390 | 445 |

24 | 205 | 255 | 310 | 370 | 425 | 485 |

25 | 220 | 280 | 340 | 400 | 460 | 525 |

26 | 240 | 305 | 370 | 435 | 500 | 570 |

27 | 260 | 330 | 400 | 470 | 540 | 615 |

28 | 280 | 355 | 430 | 510 | 585 | 665 |

29 | 305 | 385 | 465 | 545 | 630 | 715 |

30 | 325 | 410 | 495 | 585 | 675 | 765 |

31 | 350 | 440 | 530 | 625 | 720 | 820 |